Claude Fable 5 vs MAI-Thinking-1
Claude Fable 5 (2026) and MAI-Thinking-1 (2026) are frontier-tier reasoning models from Anthropic and Microsoft AI. Claude Fable 5 ships a 1M-token context window, while MAI-Thinking-1 ships a 256K-token context window. On SWE-bench Verified, Claude Fable 5 leads by 22.5 pts. On pricing, MAI-Thinking-1 costs $2/1M input tokens versus $10/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
MAI-Thinking-1 is ~400% cheaper at $2/1M; pay for Claude Fable 5 only for long-context analysis.
Decision scorecard
Local evidence first| Signal | Claude Fable 5 | MAI-Thinking-1 |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1M | 256K |
| Cheapest output | $50/1M tokens | $8/1M tokens |
| Provider routes | 8 tracked | 1 tracked |
| Shared benchmarks | SWE-bench Verified leader | 2 shared |
Decision tradeoffs
- Claude Fable 5 holds a shared-benchmark lead on SWE-bench Verified, ahead by 22.5 points.
- Claude Fable 5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Claude Fable 5 has broader tracked provider coverage for fallback and route flexibility.
- Claude Fable 5 uniquely exposes Vision, Multimodal, and Structured outputs in local model data.
- Local decision data tags Claude Fable 5 for Coding, RAG, and Agents.
- MAI-Thinking-1 has the lower cheapest tracked output price at $8/1M tokens.
- Local decision data tags MAI-Thinking-1 for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude Fable 5
$20,500
Cheapest tracked route/tier: Anthropic
MAI-Thinking-1
$3,600
Cheapest tracked route/tier: Microsoft Foundry
Estimated monthly gap: $16,900. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on Microsoft Foundry; start route-level A/B tests there.
- MAI-Thinking-1 is $42/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and Structured outputs before moving production traffic.
- Provider overlap exists on Microsoft Foundry; start route-level A/B tests there.
- Claude Fable 5 is $42/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude Fable 5 adds Vision, Multimodal, and Structured outputs in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-06-09 | 2026-08-12 |
| Context window | 1M | 256K |
| Parameters | — | 1T total / 35B active |
| Architecture | Decoder Only | Mixture of Experts |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Restricted | Restricted |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Claude Fable 5 | MAI-Thinking-1 |
|---|---|---|
| Input price | $10/1M tokens | $2/1M tokens |
| Output price | $50/1M tokens | $8/1M tokens |
| Providers |
Capabilities
| Capability | Claude Fable 5 | MAI-Thinking-1 |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | No |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude Fable 5 | MAI-Thinking-1 |
|---|---|---|
| SWE-bench Verified | 96.0 | 73.5 |
| SWE-bench Pro | 80.3 | 52.8 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has Claude Fable 5 at 96 and MAI-Thinking-1 at 73.5, with Claude Fable 5 ahead by 22.5 points; SWE-bench Pro has Claude Fable 5 at 80.3 and MAI-Thinking-1 at 52.8, with Claude Fable 5 ahead by 27.5 points. The largest visible gap is 27.5 points on SWE-bench Pro, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on vision: Claude Fable 5, multimodal input: Claude Fable 5, and structured outputs: Claude Fable 5. Both models share reasoning mode, JSON / Tool use, and JSON / Tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Claude Fable 5 lists $10/1M input and $50/1M output tokens on the cheapest tracked provider, while MAI-Thinking-1 lists $2/1M input and $8/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts MAI-Thinking-1 lower by about $18.20 per million blended tokens. Availability is 8 providers versus 1, so concentration risk also matters.
Choose Claude Fable 5 when long-context analysis, larger context windows, and broader provider choice are central to the workload. Choose MAI-Thinking-1 when provider fit and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, Claude Fable 5 or MAI-Thinking-1?
Claude Fable 5 supports 1M tokens, while MAI-Thinking-1 supports 256K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Claude Fable 5 or MAI-Thinking-1?
MAI-Thinking-1 is cheaper on tracked token pricing. Claude Fable 5 costs $10/1M input and $50/1M output tokens. MAI-Thinking-1 costs $2/1M input and $8/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Fable 5 or MAI-Thinking-1 open source?
Claude Fable 5 is listed under Proprietary. MAI-Thinking-1 is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude Fable 5 or MAI-Thinking-1?
Claude Fable 5 has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, Claude Fable 5 or MAI-Thinking-1?
Claude Fable 5 has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Claude Fable 5 and MAI-Thinking-1?
Claude Fable 5 is available on Anthropic, AWS Bedrock, GCP Vertex AI, Microsoft Foundry, and OpenRouter. MAI-Thinking-1 is available on Microsoft Foundry. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-10-17. Data sourced from public model cards and provider documentation.